To be fair, a PE <10 didn't even represent the ground truth of customer's relationship to Apple at the time. In hindsight we have a lot more information, but in that era there was still a lingering question of whether their iPhone advantage was durable, due to Android competitors. It only later became apparent that the stickiness factor was super high.

From a correct pricing perspective, of all the companies in tech Apple seems one of the most likely to keep customers for a lifetime. They have immense lock-in and customer affinity. I don't know if the correct number is 20 or 30 or 40 but unless the economy completely tanks (which tbf is reasonably possible these days), I can only imagine a majority of their customers today will still be their customers in 15-20 years.